In urinary tract infection
backache is very common. Bladder infection
, pyelonephritis are other causes of
lower back ache. You may take a muscle relaxant for pain relief. An ultrasound scan may be helpful in detecting if there is any kidney stone or anatomic /structural problem with the kidneys. Other causes of backache are injury or overuse of muscles, ligaments, and joints. It is suggested to get evaluated by your attending doctor.